In this Task the SQL Query looks up a list of servers. If no servers are found, this is a problem and the administrator needs to be alerted. A Decision Node checks the number of servers returned, and if it is not one or more an Exception is raised which is then handled by the Error Handler Node earlier in the Task.

The benefit of doing this (as opposed to just sending an email if the Decision returns false) is that we save time building the Task, because if there is an error generated by the SQL Query this will also be handled by the Error Handler.